How do I flush the radiator on my olds aurora

With a 4.0-remove the air filter housing and unbolt the ECM (located under the air housing). I did not unbolt the harness connector to the ECM, I just moved to out of the way, but if you do decide to remove it, disconnect the battery first. Remove the rubber cover above the radiator, and unbolt the brackets above the radiator. Remove the headlights (both sides) to gain access to the bolts that hold the AC condenser to the radiator, then remove the lower air dam. Drain the radiator (drain plug is on the lower corner, driver side), it is somewhat easier if you remove the air intake grill on that side which is held in place by two screws. Unbolt the bolts that hold the radiator in place to the radiator frame, then unhook the top and bottom radiator hoses at the clamps. Unhook the harnesses from the fan radiators, and lift out the assemblies as a unit, it is a tight fit. From another user on Fixya.

Because leaking gasket,normal for GM cars.

Radiator is restricted, flush or replace.

May have head gasket leak. If so will be loosing water, possibly quite slowly. At highway speeds cylinder pressure is higher and so gasket leak more likely. Means gasket damage or loose cylinder head. Can be checked by mechanic. (pressure test and cylinder head bolt tension test)
Less likely alternatives, the spark timing is too advanced or the fuel too poor.

the red/orange Dex Cool is the correct antifreeze

however, many manufactures no use a universal fluid that is clear

this fluid meets and/or exceeds all manufactures recommendations so you will be fine

let me know if I can be of any further assistance!

location of temp sensor for radiator fans on 1995 olds aurora

I had the same problem and tried several things that didn't help. A friend introduced me to a Northstar mech. that explained the real problem. Internal engine relief was faling which created overheating between cylinder sleeves and engine block creating blow back pressure in cooling system. There is a fix for this. The mechanic helped me with the problem and car is running once more... Anyone thinking they have a head gasket, intake gasket, or thermostate problem should look at this fix.

Hi, if you have flushed the radiator and changed the thermostat, the only thing that can be causing this is a faulty water pump impeller. i recommend replacing the water pump in this case. make sure your cooling fans are operational as well and check the operational value of the temp sensors on board as well.

u said the engine, the radiator has a drain plug on the back side of driver side tank on most GM, some it is on the passenger side, u must get under the car to see it and open it.

The outside temp sensor is located in front of the radiator at the bottom of the radiator....It should have a two wire harness pluged into it.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jonathan_3a3c556b4b17d1d2